<!DOCTYPE html>
<style>
    span { float:left; width:1em; }
</style>
<p>An unbreakable block that doesn't fit in the current column (that has preceding content) should be moved to the next column, even if the block is taller than the multicol container.</p>
<p>Below the word "PASS" should be seen, with large letter spacing.</p>
<div style="-webkit-columns:2; -webkit-column-gap:0; column-fill:auto; width:4em; height:10em;">
    <span>P</span><span>A</span><br>
    <div style="-webkit-column-break-inside:avoid; height:20em;"><span>S</span><span>S</span></div>
</div>
